Cleanup: Fix some misc nits in printing code.

chrome/browser/printing/print_preview_dialog_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 67 matching lines @@
   bool is_creating_print_preview_dialog() const {
     return is_creating_print_preview_dialog_;
   }
 
  private:
   friend class base::RefCounted<PrintPreviewDialogController>;
 
   // 1:1 relationship between a print preview dialog and its initiator tab.
   // Key: Print preview dialog.
   // Value: Initiator.
-  typedef std::map<content::WebContents*, content::WebContents*>
-      PrintPreviewDialogMap;
+  using PrintPreviewDialogMap =
+      std::map<content::WebContents*, content::WebContents*>;
 
   ~PrintPreviewDialogController() override;
 
   // Handler for the RENDERER_PROCESS_CLOSED notification. This is observed when
   // the initiator renderer crashed.
   void OnRendererProcessClosed(content::RenderProcessHost* rph);
 
   // Handler for the WEB_CONTENTS_DESTROYED notification. This is observed when
   // either WebContents is closed.
   void OnWebContentsDestroyed(content::WebContents* contents);
@@ skipping 32 matching lines @@
   // Whether the PrintPreviewDialogController is in the middle of creating a
   // print preview dialog.
   bool is_creating_print_preview_dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewDialogController);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_